Tony, that was element length... probably tip-to-tip. After my comment, I
saw Greg Ordy's article that I need to re-read about checking optimum Moxon
design, on K3LR's page.
It turns out my antenna is ok for "all-band" and maybe I'll lower resonant
freq since I focus on CW...
thanks,
Dave N3AC
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On Sat, Jan 8, 2022 at 8:02 AM Tony Brock-Fisher via TowerTalk <
towertalk@contesting.com> wrote:
> To answer Dave N3AC's questions:
>
> I built a version of the W6NL Moxon from scratch. Because the max length
> of readily available tubing was 6', I had to modify the taper schedule
> from the original W6NL design, which was a modification to the
> 40-2CD/XM-240. I modeled it in 4Nec2 (therefore limited to the NEC2
> engine) and results came out low in frequency. Minimum SWR was right at
> 7.0 MHz; max gain was around 6.8 MHz. On the advice of K3LR and K1GU, I
> used the same lengths as in the original design and it came out spot-on.
>
> Dave: What do you mean by 'wingspan'? Boom length or element length?
> This would likely have a significant effect.
>
> Modeling curves and details were presented at Dayton Antenna Forum 2012,
> available in pdf from K3LR's website:
>
> https://www.kkn.net/dayton2012/DaytonAntennaPaper05102012.pdf
>
> My design 'package' available on request - email me directly off-list.
>
> Let me add my kudos to W6NL for this amazing design! The bandwidth of
> the original CC design(s) is partially due to loading coil losses. The
> W6NL design achieves wider bandwidth without loading coils, which
> implies much higher efficiency.
>
> -Tony, K1KP
>
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